Hair clipper



Patented Mar. 3, 1931 i OFFICE y HENRY'KOCOUREK, er cnicaeo, minimis, essreiion fro cnicaeo FLEXIBLE SHAFT COMPANY, vor cnrcaeo, rnLiNois, n coeronnrron or ILLINOIS A HAIR cnrrrnn The purpose of thisv invention is to provide an improved construction in hairclippers and liketools in respect to they means for guidance of the vibrating cutter on the fixed cutter. It consists in the elements and features of construction shown and described as indicated in the claim.

In the drawings:

Figure l is a' plan viewof a portion of hair 1o clipper comprising the fixed and vibrating cutter membersy and showing the means of guidance which constitutes the present invention on an enlarged scale. Y Figure 2 is a section at the' line 2 2 on Figure l upon the same scale.

Figure 3 is a dissected detail sectional view,

^ section being made at the same plane on Figure 2.

In hair clippers and like tools of common construction, the vibrating cutter blade mounted upon the upper surface of the-fixed cutter and comb and actuated by any operating means for reciprocating or vibrating the upper blade on the lower, is commonly guided inthe reciprocation by studs pro- )ect-ing upwardly from the fixed blade engaging slots elongated in the direction of the vibratory movement of the cutter blade, the studs having their heads which afford the guidance dimensioned transversely ofthe direction of the reciprocation for fitting thel slots as closely as consistent with the necessary movability involved in the vibration. These studs have their heads, as indicated,

formed to afford adequate bearing surface on the sides of the slot to endure the wear resulting from the vibratory movement without being too rapidly worn away so as to defeat the accuracy of the guidance for which the studs are provided.y vAnd when the studs,

as is customary, are secured to the fixed cutter blade by being screwed thereinto, it will be seen that the threading of the hole in theV plate and of the studs must bekvery accurately done to cause the stud when vscrewed into the hole to come tight at the position at which the head stands withthe flat sides with which the edges yof the slot co-operate for guidance in the vibratory movement, positioned parallel to said movement. And it will be 192s; serial No. 270,866.

performed upon the surface upon-which the vibratory blade is lodged and slides, and from which the studs protrude, the vshoulders of the studs back of the` reduced terminal which is threaded for screwing into the tnreadedholes of the plate, will no longer be found positioned so that the stud willA come tight in the threaded hole, with the head `at the same point position in the path of ro` tation of the stud in screwing it home; and

in order tovhave the stud come tight with the guiding faces of its head properly positioned ,with respect tothe slot, either the shoulder of the stud must be' cut back an amount corresponding'to the reduction of the plate by they grinding, or the stud must be forced around `after it becomes normally tight througha sufiicient angle to bring a flat guiding face of the head parallelvvith the sides of the slot; and that avery limited amount ofisuch forcing of the stud atrits threaded engagement with the plate will kso mutilate thethread either of the plate or of the stud, aste `render the same insecure by'reason of the strippingrof one thread or the other.

f The purpose of the'present inventionis to obviate this difficulty and provide a construction inwhich the customary square-headed Vstud may vbe screwed into the plate so as to be reliably tight therein with the guiding surfaces of its head properly positioned with resp'ecttov .thersides of the slot, and that the grinding of the plate for sharpening the teeth to vthe 'maximum extent `to which the plate is adapted to be. ground without becoming too thin :for service, shall not necessitate any altcration fin the stud in orderthat it may come tight with its head in proper position-when plate which' hasV beenV thus EGO CIJ

iitting in the elongated slots, B17, of the vibrating cutter, B. The holes, a, in the fixed cutter, A, for holding the studs, C, are counterbored from the upper sideof the plate, as seen at al, to a diameter which exceeds slightly the diameter of the bottom Oi' the interior thread, a2, the depth or this counterborebeing sutlicient to accommodate the tapered slioulder oi' the stud hereinafter described; and said holes are further counterbored as seen at a3 to a diameter for admitting the square heads, C1, of t-he studs and allowing them to rotate in said counterbore.

he studs, C, C, have their square heads,

, C1, dimensioned for a suitable sliding lit in the slots, Bl, of the vibrating cutter, and the studs are reduced in diameter at the inner end and threaded for engaging the thread, a2, of the holes, a, in the plate, A, and are formed with a rusto-conical shoulder, 02, back of the thread. rlhe counterboring of the plate holes at al, as described, causes the corner of the hole at the surface oli the plate to be angular, as seen at alo, and the relative dimensions of the counterbore and the conical shoulder of the studs is such that in screwing home the stud the angular corner of the plate, which is hardened for its function of cutting, tends to cutr a groove inthe conical shoulder of the stud, which is relatively softer than the plate; and in the lirst instance of screwing home the stud to bring the flat surface of the head properly positioned with respect to the sides of the' slot, the studs may be rotatedl through a very 1 substantial angle, if necessary, while the angular corner of the hole cuts the groove in the conical shoulder of the stud; and the operator in the lirst instance of setting the studs in the plate may rotate the stud after the conical shoulder comes in touch with'the core ner, 0a1", of the hole more than'the distance necessary to bring the first arriving `face of the stud head in alignment with the slot; andl if at the position at which the shoulder comes in touch with said corner said lirst arriving face of the stud is so nearly in alignment with the slot that the turning 'of the Vstud enoughA farther to merely eiect alignment will not bring the stud sufficiently in alignment in the plate, the operator may rotate the stud an guiding the vibrating Critter, and in order that the advantage above described may be obtained, it is of course necessary that after the grinding of the plate, the studs should be replaced in the same holes in which they were originally screwed; and in order to facilitate this, the studsv are identilied with the respec- `tive holes by applying to the holes on the plates and to the studs on their heads, identitying markings, which may be the numerals l and 2, as seen inthe drawings.

I claimz- A member having a finished surface with a threaded aperture and a guide stud screwed into said aperture with its head portion standing aboveethe finished surface, the threaded aperture being counterbored at the upper end to form a circular angular Corner and the stud having a sloping shoulder under its head portion dimensioned to engage said angular f corner, the plate being hard relatively to the stud so that said corner tends to cut into the sloping shoulder and cause the stud to come tight for lirm secureinent in the plate..

.ln testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 11th day of April, A. D. 1928.

HENRY IOCOUREK.

additional 90 to bring the next face of theV head intoguiding relation of the slot.

v lVhen the plate is ground for sharpening,

the grinding will not reach thev shoulder termed by the counterbore, a3, and will not change the relationfof that shoulder to the thread; and the frusto-conical shoulder or' the stud will Vcome tight upon the angular corner, a10,-atithe same point in the rotation for screwing it into the plate as in the original setting; and the liability to multilate the thread in order to screw the studV in to the necessary distance for setting the faces of the head properly with respect to the slot is avoided. Y

.Tw-o guidestuds are necessary lfor properly 

